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// Copyright 2018 The dexon-consensus Authors
// This file is part of the dexon-consensus library.
//
// The dexon-consensus library is free software: you can redistribute it
// and/or modify it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation, either version 3 of the License,
// or (at your option) any later version.
//
// The dexon-consensus library is distributed in the hope that it will be
// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
// General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the dexon-consensus library. If not, see
// <http://www.gnu.org/licenses/>.
package core
import (
"time"
"github.com/byzantine-lab/dexon-consensus/common"
"github.com/byzantine-lab/dexon-consensus/core/crypto"
"github.com/byzantine-lab/dexon-consensus/core/types"
typesDKG "github.com/byzantine-lab/dexon-consensus/core/types/dkg"
)
// Application describes the application interface that interacts with DEXON
// consensus core.
type Application interface {
// PreparePayload is called when consensus core is preparing a block.
PreparePayload(position types.Position) ([]byte, error)
// PrepareWitness will return the witness data no lower than consensusHeight.
PrepareWitness(consensusHeight uint64) (types.Witness, error)
// VerifyBlock verifies if the block is valid.
VerifyBlock(block *types.Block) types.BlockVerifyStatus
// BlockConfirmed is called when a block is confirmed and added to lattice.
BlockConfirmed(block types.Block)
// BlockDelivered is called when a block is added to the compaction chain.
BlockDelivered(hash common.Hash, position types.Position, rand []byte)
}
// Debug describes the application interface that requires
// more detailed consensus execution.
type Debug interface {
// BlockReceived is called when the block received in agreement.
BlockReceived(common.Hash)
// BlockReady is called when the block's randomness is ready.
BlockReady(common.Hash)
}
// Network describs the network interface that interacts with DEXON consensus
// core.
type Network interface {
// PullBlocks tries to pull blocks from the DEXON network.
PullBlocks(hashes common.Hashes)
// PullVotes tries to pull votes from the DEXON network.
PullVotes(position types.Position)
// BroadcastVote broadcasts vote to all nodes in DEXON network.
BroadcastVote(vote *types.Vote)
// BroadcastBlock broadcasts block to all nodes in DEXON network.
BroadcastBlock(block *types.Block)
// BroadcastAgreementResult broadcasts agreement result to DKG set.
BroadcastAgreementResult(randRequest *types.AgreementResult)
// SendDKGPrivateShare sends PrivateShare to a DKG participant.
SendDKGPrivateShare(pub crypto.PublicKey, prvShare *typesDKG.PrivateShare)
// BroadcastDKGPrivateShare broadcasts PrivateShare to all DKG participants.
BroadcastDKGPrivateShare(prvShare *typesDKG.PrivateShare)
// BroadcastDKGPartialSignature broadcasts partialSignature to all
// DKG participants.
BroadcastDKGPartialSignature(psig *typesDKG.PartialSignature)
// ReceiveChan returns a channel to receive messages from DEXON network.
ReceiveChan() <-chan types.Msg
// ReportBadPeerChan returns a channel to report bad peer.
ReportBadPeerChan() chan<- interface{}
}
// Governance interface specifies interface to control the governance contract.
// Note that there are a lot more methods in the governance contract, that this
// interface only define those that are required to run the consensus algorithm.
type Governance interface {
// Configuration returns the configuration at a given round.
// Return the genesis configuration if round == 0.
Configuration(round uint64) *types.Config
// CRS returns the CRS for a given round. Return the genesis CRS if
// round == 0.
//
// The CRS returned is the proposed or latest reseted one, it would be
// changed later if corresponding DKG set failed to generate group public
// key.
CRS(round uint64) common.Hash
// Propose a CRS of round.
ProposeCRS(round uint64, signedCRS []byte)
// NodeSet returns the node set at a given round.
// Return the genesis node set if round == 0.
NodeSet(round uint64) []crypto.PublicKey
// Get the begin height of a round.
GetRoundHeight(round uint64) uint64
//// DKG-related methods.
// AddDKGComplaint adds a DKGComplaint.
AddDKGComplaint(complaint *typesDKG.Complaint)
// DKGComplaints gets all the DKGComplaints of round.
DKGComplaints(round uint64) []*typesDKG.Complaint
// AddDKGMasterPublicKey adds a DKGMasterPublicKey.
AddDKGMasterPublicKey(masterPublicKey *typesDKG.MasterPublicKey)
// DKGMasterPublicKeys gets all the DKGMasterPublicKey of round.
DKGMasterPublicKeys(round uint64) []*typesDKG.MasterPublicKey
// AddDKGMPKReady adds a DKG ready message.
AddDKGMPKReady(ready *typesDKG.MPKReady)
// IsDKGMPKReady checks if DKG's master public key preparation is ready.
IsDKGMPKReady(round uint64) bool
// AddDKGFinalize adds a DKG finalize message.
AddDKGFinalize(final *typesDKG.Finalize)
// IsDKGFinal checks if DKG is final.
IsDKGFinal(round uint64) bool
// AddDKGSuccess adds a DKG success message.
AddDKGSuccess(success *typesDKG.Success)
// IsDKGSuccess checks if DKG is success.
IsDKGSuccess(round uint64) bool
// ReportForkVote reports a node for forking votes.
ReportForkVote(vote1, vote2 *types.Vote)
// ReportForkBlock reports a node for forking blocks.
ReportForkBlock(block1, block2 *types.Block)
// ResetDKG resets latest DKG data and propose new CRS.
ResetDKG(newSignedCRS []byte)
// DKGResetCount returns the reset count for DKG of given round.
DKGResetCount(round uint64) uint64
}
// Ticker define the capability to tick by interval.
type Ticker interface {
// Tick would return a channel, which would be triggered until next tick.
Tick() <-chan time.Time
// Stop the ticker.
Stop()
// Retart the ticker and clear all internal data.
Restart()
}
// Recovery interface for interacting with recovery information.
type Recovery interface {
// ProposeSkipBlock proposes a skip block.
ProposeSkipBlock(height uint64) error
// Votes gets the number of votes of given height.
Votes(height uint64) (uint64, error)
}
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